8 ohm or 16 ohm?

Discussion in 'Cabinets & Speakers' started by BowerR64, Mar 11, 2015.

  1. BowerR64

    BowerR64 Well-Known Member

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    Has anyone noticed a difference in tone between 8 or 16?

    I have an 8ohm 4X12 Marshall, my friend has a 16 ohm peavey valve king 4X12 tonight i hooked my Marshall head to his cabinet and it sounded really thin compared to mine.

    Mine is the smaller MG4X12a and i replaced the stock MG celestions with 4 G3 EMIs

    Only other thing i can think of is maybe its wired wrong.
     
    Last edited: Mar 11, 2015
  2. blues_n_cues

    blues_n_cues Well-Known Member VIP Member

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    all of the above doesn't create a fair comparison.

    I have noticed a difference w/in the same cab & same head.
    on my rig 16 sounds fine but 8 sounds suspiciously ((stereo)). :hmm:

    BWAHAHAHA.:lol:
     
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  3. metromutt

    metromutt Active Member

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    The difference you're hearing is between the two cabs, construction/speakers etc. not ohms. Some say you can hear a slight difference but I've never experienced it.

    Your sig line made me laugh, I was going to comment on the MG build quality but it made me feel like a gear snob:lol:
    :shred:with watcha got:yesway:
     
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  4. Micky

    Micky Well-Known Member VIP Member

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    No perceivable difference between 8 & 16 ohm speakers...
     
  5. Frodebro

    Frodebro Well-Known Member

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    Nope, not the speakers themselves. However, the different taps off of the output transformer can have slight variances in sound (though this is more of an internet nit-picking thing than a huge night-and-day difference).
     
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  6. Micky

    Micky Well-Known Member VIP Member

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    Didn't I just say that?
     
  7. Frodebro

    Frodebro Well-Known Member

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    You didn't say anything about the output transformer, just the speakers themselves. :wave:
     
  8. Micky

    Micky Well-Known Member VIP Member

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    The OP didn't ask anything about a transformer.
     
  9. chuckharmonjr

    chuckharmonjr Well-Known Member

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    Wait a minute...isn't he playing thru a MG? Solid state output section there can be a huge difference between 8ohm and 16ohm.
     
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  10. Frodebro

    Frodebro Well-Known Member

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    He didn't ask about cabinet dimensions or speaker differences, either. ;)
     
  11. Frodebro

    Frodebro Well-Known Member

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    The cab is an MG, but he didn't specify which head he has (he just said "Marshall").
     
  12. BowerR64

    BowerR64 Well-Known Member

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    Yeah it is a Marshall MG100HDFX solid state, and my cabinet is the MG cabinet that came with it but i replaced the speakers with the G3 EMIs

    HIs has the 16 ohm green back peavey valveking speakers.

    My head will run anywhere from 4 ohms and up

    With the MG cabinet i have to roll the bass back a bit but with his it didnt seem to have enough bass.

    He has a Orange dark terror and i notice the same thing with that amp he has it just sounds thin and lifeless.

    He could have it wired wrong, he got it at MF when it was here in kansas city and it was a scratch and dent item so who know who had it before him and what they did with it.

    He doesnt care really but i just think he can get more out of it is all.

    The back of his amp has 2 8ohm outs and 1 16 ohm out. His cabinet has 2 inputs i think one is in, and one is threw. Like a daisy chain thing for another cabinet. I think we should try and run each pair into one output and he can hook them both to the 8ohm outs on the back of his amp just run 2 speaker cables.

    Wire each pair of 16 ohm speaker in parallel to get 8 ohms each pair. 1 pair will go to 1 output like a stereo cabinet.
     
  13. blues_n_cues

    blues_n_cues Well-Known Member VIP Member

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    probably because yours is MDF & his is 1/2" birch/plywood.
    then there's the Peavey spkrs which to my ears are bright & brittle to begin with.
    here's his manual-
    http://assets.peavey.com/literature/specs/00575760_3.pdf
     
  14. chuckharmonjr

    chuckharmonjr Well-Known Member

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    With a solid state amp, going from 8 to 16 you lose a bunch of power. The head is actually rated for 4 ohms, so going to 16 you lose well over half the usable power.
     
  15. chuckharmonjr

    chuckharmonjr Well-Known Member

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    For sound pressure level purposes, it becomes basically a 40 watter or less.
     
  16. Georgiatec

    Georgiatec Well-Known Member VIP Member

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    100 watts @ 4 ohms into a 16 ohm load = 25 watts max output. There you have the reason the VK cab sounds weak plus the fact they are also crap, of course :shrug: .....sorry, I don't mind being a gear snob. :cool:

    Even using your 8 ohm cab your amp is only putting out around 50 watts cranked.....you need a 4 x 12 like a 1960 that has series/parallel wiring so you can set the cab to give 4/8/16 ohm load. :yesway:
     
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  17. Ghostman

    Ghostman Well-Known Member

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    I see what you did there. :D
    :lol::lol:
     
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  18. supershifter2

    supershifter2 Active Member

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  19. desmondtencents

    desmondtencents Member

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    Not trying to be a d__k here. I'm not a gear snob but I can be a bit of a tech snob.
    100 watts @ 4 ohms into a 16 ohm load will not reduce the power output to 25%
    Any mismatch (up or down) will result in less than 100% power transfer but it's not a proportional reduction.
    Higher impedance loads are safer because they also reduce the stress/load on internal amplifier components.
    Lower impedance loads will also result in lower power transfers but INCREASE the stresses/loading on internal components. HEAT KILLS!
    Lots of good info here:
    Impedance Matching of Audio Components
    Scroll down to "Matching Amplifier to Loudspeaker"
    Notice in the example the amp output is rated for 8 ohms with output power at 50 watts.
    When connected to a 16 ohm load the output wattage is reduced to 44 watts. Not 25.
    Also consider the total power required to produce the 50 watts at 8 ohms is 100 watts.
    When connected to the 16 ohm load the total power required also drops to 67 watts.
    Now go the other way and connect a lower impedance load of 4 ohms. Output power is again lowered (to 44 watts) but the total power required to drive the load goes up to 133 watts!
    Go even lower to a 2 ohm load and the output power falls even further to 32 watts but the total power required now jumps to 160 watts!
    Now we can see why (even thought the output wattage is lowered) the output transformers are overloaded when connected to lower impedance loads than what they're designed to handle.
    This also shows the difference between "output power" and "total power"
    An amp's rating is typically listed as the output power rating. (though it's possible some manufacturers will use the total power ratings to "hype up" or overstate the capabilities of their gear)
     
  20. chuckharmonjr

    chuckharmonjr Well-Known Member

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    umm Desmond? We're talking solid state SCR's, bud.
     
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